Delete fifo

Purpose: Delete FIFO list elements up to the last one read, including.

 delete-fifo <list>

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delete-fifo will delete all leading elements from the FIFO <list> up to the last one read, including. <list> was created by new-fifo.

Right after rewind-fifo, no element was read yet, and delete-fifo will have no effect. After any read-fifo, delete-fifo wil delete all elements up to the element read, including that element.

Examples

 new-fifo mylist

 // Add data to the list
 write-fifo mylist key "key1" value "value1"
 write-fifo mylist key "some2" value "other2"

 // Get first data from the list
 read-fifo mylist key k value v

 // Delete first element from the list, so list will have only "some2" key
 delete-fifo mylist

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